I have heard that if adderall makes you tired, you probably need a lower dose, but I don’t know if that is true. I will say I started on 5 mg adderall xr once daily and eventually got up to 20 mg. I felt really sleepy on the 20 mg and had major restless leg syndrome, so I went back down to the 15 mg and feel much better. I still get worn out in the afternoons, but I think it is from medication wearing off. Good luck!